停止拍照后等待一段时间，确保session停止

app/src/main/cpp/camera2/ndkcamera.cpp

@@ -1192,6 +1192,7 @@ void NdkCamera::close()
 	{
 		// res = ACameraCaptureSession_stopRepeating(capture_session);
 		ACameraCaptureSession_close(capture_session);
+		std::this_thread::sleep_for(std::chrono::milliseconds(512));
 		capture_session = 0;
 	}